Csdn.net CSDN-专业IT技术社区
csdn.net Desktop Performance
50/100
These metrics represent real-world Chrome users experience viewing csdn.net web page. Reports are focused on loading performance and other critical factors that most affect user experience. Follow our guide to track, optimize, and improve the quality of your web pages.
User Loading Experience
Cumulative Layout Shift
Largest Contentful Paint
First Input Delay
First Contentful Paint
Metrics
Total Blocking Time2/100 1,290 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Speed Index6/100 4.5 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Time to Interactive54/100 4.3 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Largest Contentful Paint85/100 1.4 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
First Contentful Paint95/100 0.8 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Cumulative Layout Shift100/100 0.001
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (16)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Reduce initial server response time
Root document took 2,380 ms
1,782 ms
Serve images in next-gen formats
Potential savings of 1,071 KiB
1,640 ms
Defer offscreen images
Potential savings of 668 KiB
600 ms
Efficiently encode images
Potential savings of 285 KiB
240 ms
Remove unused JavaScript
Potential savings of 191 KiB
200 ms
Properly size images
Potential savings of 212 KiB
180 ms
Eliminate render-blocking resources
Potential savings of 170 ms
166 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Serve static assets with an efficient cache policy
23 resources found
Avoid an excessive DOM size
1,268 elements
Minimize main-thread work
3.3 s
Reduce JavaScript execution time
2.1 s
Largest Contentful Paint element
1 element found
Avoid long main-thread tasks
5 long tasks found
Avoid large layout shifts
5 elements found
Avoid chaining critical requests
16 chains found
Keep request counts low and transfer sizes small
129 requests • 2,240 KiB
Passed Audits (13)
All text remains visible during webfont loads
Avoid multiple page redirects
Potential savings of 190 ms
Enable text compression
Potential savings of 24 KiB
Uses passive listeners to improve scrolling performance
Use video formats for animated content
Minimize third-party usage
Third-party code blocked the main thread for 0 ms
Avoids `document.write()`
Preload key requests
Minify CSS
Remove unused CSS
Potential savings of 17 KiB
Minify JavaScript
Potential savings of 11 KiB
Preconnect to required origins
Avoids enormous network payloads
Total size was 2,240 KiB
csdn.net Desktop SEO
82/100
These checks ensure that your page is optimized for search engine results ranking. There are additional factors Lighthouse does not check that may affect your search ranking. Learn more. Run these additional validators on your site to check additional SEO best practices.
Should Fix (2)
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Image elements do not have `[alt]` attributes
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Links are not crawlable
Passed Audits (9)
Document avoids plugins
Page isn’t blocked from indexing
Page has successful HTTP status code
Links have descriptive text
robots.txt is valid
Document has a meta description
Document has a valid `hreflang`
Document has a `<title>` element
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
csdn.net Desktop Best Practices
54/100
These checks highlight opportunities to improve the overall code health of csdn.net page. Current recommendations will help to make your page fast and secure, to create a good user experience and to avoid deprecated technologies.
Should Fix (6)
Trust and Safety
Does not use HTTPS
1 insecure request found
Includes front-end JavaScript libraries with known security vulnerabilities
4 vulnerabilities detected
Links to cross-origin destinations are unsafe
User Experience
Displays images with incorrect aspect ratio
General
Browser errors were logged to the console
Uses deprecated APIs
1 warning found
Passed Audits (8)
Avoids requesting the geolocation permission on page load
Properly defines charset
Avoids requesting the notification permission on page load
Detected JavaScript libraries
Serves images with appropriate resolution
Page has the HTML doctype
Allows users to paste into password fields
Avoids Application Cache
csdn.net Desktop Progressive Web App
19/100
These checks validate the aspects of a Progressive Web App. Learn more. These checks are required by the baseline PWA Checklist but are not automatically checked by Lighthouse. They do not affect your score but it's important that you verify them manually.
Should Fix (10)
Fast and reliable
`start_url` does not respond with a 200 when offline
Page load is not fast enough on mobile networks
Interactive on simulated mobile network at 18.3 s
Current page does not respond with a 200 when offline
PWA Optimized
Does not set a theme color for the address bar.
Is not configured for a custom splash screen
Does not provide a valid `apple-touch-icon`
Manifest doesn't have a maskable icon
Installable
Web app manifest does not meet the installability requirements
Does not use HTTPS
1 insecure request found
Does not register a service worker that controls page and `start_url`
Passed Audits (3)
Contains some content when JavaScript is not available
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Redirects HTTP traffic to HTTPS
csdn.net Desktop Accessibility
53/100
These checks highlight opportunities to improve the accessibility of your web app. Only a subset of accessibility issues can be automatically detected so manual testing is also encouraged. These items address areas which an automated testing tool cannot cover. Learn more in our guide on conducting an accessibility review.
Should Fix (11)
Best practices
These items highlight common accessibility best practices.
`[user-scalable="no"]` is used in the `<meta name="viewport">` element or the `[maximum-scale]` attribute is less than 5.
ARIA
These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.
ARIA input fields do not have accessible names
Elements with an ARIA `[role]` that require children to contain a specific `[role]` are missing some or all of those required children.
Names and labels
These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.
Links do not have a discernible name
`<frame>` or `<iframe>` elements do not have a title
Image elements do not have `[alt]` attributes
Form elements do not have associated labels
Internationalization and localization
These are opportunities to improve the interpretation of your content by users in different locales.
`<html>` element does not have a `[lang]` attribute
Tables and lists
These are opportunities to to improve the experience of reading tabular or list data using assistive technology, like a screen reader.
Lists do not contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`<dl>`'s do not contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
Passed Audits (12)
`[aria-hidden="true"]` elements do not contain focusable descendents
Buttons have an accessible name
Heading elements appear in a sequentially-descending order
Definition list items are wrapped in `<dl>` elements
`[aria-hidden="true"]` is not present on the document `<body>`
`[role]`s have all required `[aria-*]` attributes
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
Document has a `<title>` element
`[role]` values are valid
`[role]`s are contained by their required parent element
The page contains a heading, skip link, or landmark region
`[id]` attributes on active, focusable elements are unique
Desktop Speed
46/100
These checks analyze the performance of csdn.net on desktop devices and return PageSpeed score and information on how to improve the load time. What makes a good Progressive Web App?
Should Fix (8)
Optimize images
Enable compression
Leverage browser caching
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Minify JavaScript
Prioritize visible content
Minify HTML
Minify CSS
Passed Audits (2)
Avoid landing page redirects
Reduce server response time
www.csdn.com
www.csdn.net
www.csdn.org
www.csdn.info
www.csdn.biz
www.csdn.us
www.csdn.mobi
www.sdn.net
www.csdn.net
www.xsdn.net
www.cxsdn.net
www.xcsdn.net
www.dsdn.net
www.cdsdn.net
www.dcsdn.net
www.fsdn.net
www.cfsdn.net
www.fcsdn.net
www.vsdn.net
www.cvsdn.net
www.vcsdn.net
www.cdn.net
www.cwdn.net
www.cswdn.net
www.cwsdn.net
www.cedn.net
www.csedn.net
www.cesdn.net
www.cddn.net
www.csddn.net
www.czdn.net
www.cszdn.net
www.czsdn.net
www.cxdn.net
www.csxdn.net
www.cadn.net
www.csadn.net
www.casdn.net
www.csn.net
www.csxn.net
www.csdxn.net
www.cssn.net
www.csdsn.net
www.cssdn.net
www.csen.net
www.csden.net
www.csrn.net
www.csdrn.net
www.csrdn.net
www.csfn.net
www.csdfn.net
www.csfdn.net
www.cscn.net
www.csdcn.net
www.cscdn.net
www.csd.net
www.csdb.net
www.csdnb.net
www.csdbn.net
www.csdh.net
www.csdnh.net
www.csdhn.net
www.csdj.net
www.csdnj.net
www.csdjn.net
www.csdm.net
www.csdnm.net
www.csdmn.net
www.csdn.net
www.csdn.org
www.csdn.info
www.csdn.biz
www.csdn.us
www.csdn.mobi
www.sdn.net
www.csdn.net
www.xsdn.net
www.cxsdn.net
www.xcsdn.net
www.dsdn.net
www.cdsdn.net
www.dcsdn.net
www.fsdn.net
www.cfsdn.net
www.fcsdn.net
www.vsdn.net
www.cvsdn.net
www.vcsdn.net
www.cdn.net
www.cwdn.net
www.cswdn.net
www.cwsdn.net
www.cedn.net
www.csedn.net
www.cesdn.net
www.cddn.net
www.csddn.net
www.czdn.net
www.cszdn.net
www.czsdn.net
www.cxdn.net
www.csxdn.net
www.cadn.net
www.csadn.net
www.casdn.net
www.csn.net
www.csxn.net
www.csdxn.net
www.cssn.net
www.csdsn.net
www.cssdn.net
www.csen.net
www.csden.net
www.csrn.net
www.csdrn.net
www.csrdn.net
www.csfn.net
www.csdfn.net
www.csfdn.net
www.cscn.net
www.csdcn.net
www.cscdn.net
www.csd.net
www.csdb.net
www.csdnb.net
www.csdbn.net
www.csdh.net
www.csdnh.net
www.csdhn.net
www.csdj.net
www.csdnj.net
www.csdjn.net
www.csdm.net
www.csdnm.net
www.csdmn.net